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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad280da697f9c2556db9af464659b6b74a62a11fed8628a23c11e34619f8401' 
  AND token = 'Ev/gggQYMEHAM53dLI4/MDun6eR4BUio7+lO0yjWUzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}